Logger Module - power consumption

[RichieJH]

I couldn't see this in the documentation, but I might have missed it. Does the Logger Module consume additional power when it is enabled/initialised? If it does, presumably it needs to be disabled in shipping and what is the best method for disabling it to ensure it doesn't consume any additional power?

In my observation if it is consuming power, it isn't much from some measurements I've been running on the PPK. But of course, every 1uA is precious.

This is SDK13 too by the way.

[Roger Clark]

Do you mean using NRF_LOG_INFO and NRF_LOG_DEBUG ??

If so, it depends on how its configured, if its UART then it definitely takes more power.

If you are using Segger RTT I don't know , but probably won't

Also, are you aware that immediatly after upload via SWD the MCU is in a sort of debugging mode, so you need to to a hard reset before measuring current consumption.

[RichieJH]

Yes, that is what I am referring to - and I'm referring to RTT not UART.

[ovrebekk]

Hi Richie

Even without the debugger connected the RTT logging will probably burn through some extra clock cycles when pushing log data to RAM, increasing the average current somewhat.

For optimal power consumption I would disable logging before compiling the release hex file.

Best regards
Torbjørn

[RichieJH]

Thanks. What is the best way to disable it. Comment the init out of main, disable module in sdk_config, anything else?

[ovrebekk]

Hi
Turning off NRF_LOG_ENABLED in sdk_config.h should be sufficient.

Best regards